Enable cc::Surface backend for exo Surfaces by default.

components/exo/display.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/exo/display.h"
 
 #include <iterator>
 #include <utility>
 
 #include "ash/common/wm/wm_shell_window_ids.h"
@@ skipping 11 matching lines @@
 #include <GLES2/gl2extchromium.h>
 #include "components/exo/buffer.h"
 #include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "ui/aura/env.h"
 #endif
 
 namespace exo {
 
-const char kUseExoSurfaceLayer[] = "use-exo-surface-layer";
+const char kDisableExoSurfaceLayer[] = "disable-exo-surface-layer";
 
 ////////////////////////////////////////////////////////////////////////////////
 // Display, public:
 
 Display::Display() {
   Surface::SetUseSurfaceLayer(
-      base::CommandLine::ForCurrentProcess()->HasSwitch(kUseExoSurfaceLayer));
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(
+          kDisableExoSurfaceLayer));
 }
 
 Display::~Display() {}
 
 std::unique_ptr<Surface> Display::CreateSurface() {
   TRACE_EVENT0("exo", "Display::CreateSurface");
 
   return base::WrapUnique(new Surface);
 }
 
@@ skipping 115 matching lines @@
 
   if (surface->HasSurfaceDelegate()) {
     DLOG(ERROR) << "Surface has already been assigned a role";
     return nullptr;
   }
 
   return base::WrapUnique(new SubSurface(surface, parent));
 }
 
 }  // namespace exo